%------------------------------------------------------------------------------
% File : iProver---3.9.4
% Problem : SET880+1 : TPTP v9.3.1. Released v3.2.0.
% Transfm : none
% Format : tptp:raw
% Command : run_iprover 300 /export/starexec/sandbox/benchmark/theBenchmark.p THM
% Computer : n011.cluster.edu
% Model : x86_64 x86_64
% CPU : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory : 8046.5625MB
% OS : Linux 6.8.0-71-generic
% CPULimit : 300s
% WCLimit : 300s
% DateTime : Fri Sep 25 02:48:52 PM UTC 2026
% Result : Theorem 0.14s 15.88s
% Output : CNFRefutation 0.14s
% Verified :
% SZS Type : Refutation
% Derivation depth : 11
% Number of leaves : 6
% Syntax : Number of formulae : 30 ( 12 unt; 3 def)
% Number of atoms : 87 ( 50 equ)
% Maximal formula atoms : 10 ( 2 avg)
% Number of connectives : 78 ( 32 ~; 29 |; 12 &)
% ( 3 <=>; 2 =>; 0 <=; 0 <~>)
% Maximal formula depth : 9 ( 4 avg)
% Maximal term depth : 3 ( 1 avg)
% Number of types : 1 ( 0 usr)
% Number of type conns : 0 ( 0 >; 0 *; 0 +; 0 <<)
% Number of predicates : 6 ( 4 usr; 4 prp; 0-2 aty)
% Number of functors : 6 ( 6 usr; 3 con; 0-2 aty)
% Number of variables : 39 ( 0 sgn 35 !; 4 ?; 8 :)
% Comments :
%------------------------------------------------------------------------------
fof(f2,axiom,
! [X0,X1] :
( X1 = singleton(X0)
<=> ! [X2] :
( in(X2,X1)
<=> X2 = X0 ) ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',d1_tarski) ).
fof(f4,axiom,
! [X0,X1] :
( set_difference(singleton(X0),X1) = empty_set
<=> in(X0,X1) ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',l36_zfmisc_1) ).
fof(f7,conjecture,
! [X0,X1] :
( set_difference(singleton(X0),singleton(X1)) = empty_set
=> X0 = X1 ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',t21_zfmisc_1) ).
fof(f8,negated_conjecture,
~ ! [X0,X1] :
( set_difference(singleton(X0),singleton(X1)) = empty_set
=> X0 = X1 ),
inference(negated_conjecture,[status(cth)],[f7]) ).
fof(f10,plain,
? [X0,X1] :
( set_difference(singleton(X0),singleton(X1)) = empty_set
& X0 != X1 ),
inference(ennf_transformation,[],[f8]) ).
fof(f11,plain,
! [X0,X1] :
( ( singleton(X0) != X1
| ! [X2] :
( ( ~ in(X2,X1)
| X2 = X0 )
& ( X0 != X2
| in(X2,X1) ) ) )
& ( ? [X2] :
( ( in(X2,X1)
| X2 = X0 )
& ( ~ in(X2,X1)
| X0 != X2 ) )
| X1 = singleton(X0) ) ),
inference(nnf_transformation,[],[f2]) ).
fof(f12,plain,
! [X0,X1] :
( ( singleton(X0) != X1
| ! [X3] :
( ( ~ in(X3,X1)
| X0 = X3 )
& ( X0 != X3
| in(X3,X1) ) ) )
& ( ? [X2] :
( ( in(X2,X1)
| X2 = X0 )
& ( ~ in(X2,X1)
| X0 != X2 ) )
| X1 = singleton(X0) ) ),
inference(rectify,[],[f11]) ).
fof(f13,plain,
! [X0,X1] :
( ( singleton(X0) != X1
| ! [X3] :
( ( ~ in(X3,X1)
| X0 = X3 )
& ( X0 != X3
| in(X3,X1) ) ) )
& ( ( ( in(sK0(X0,X1),X1)
| sK0(X0,X1) = X0 )
& ( ~ in(sK0(X0,X1),X1)
| sK0(X0,X1) != X0 ) )
| X1 = singleton(X0) ) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK0]),skolemize(X2,sK0(X0,X1))],[f12]) ).
fof(f14,plain,
! [X0,X1] :
( ( empty_set != set_difference(singleton(X0),X1)
| in(X0,X1) )
& ( ~ in(X0,X1)
| set_difference(singleton(X0),X1) = empty_set ) ),
inference(nnf_transformation,[],[f4]) ).
fof(f17,plain,
( empty_set = set_difference(singleton(sK3),singleton(sK4))
& sK3 != sK4 ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK3,sK4]),skolemize(X0,sK3),skolemize(X1,sK4)],[f10]) ).
fof(f19,plain,
! [X3,X0,X1] :
( singleton(X0) != X1
| ~ in(X3,X1)
| X0 = X3 ),
inference(cnf_transformation,[],[f13]) ).
fof(f24,plain,
! [X0,X1] :
( empty_set != set_difference(singleton(X0),X1)
| in(X0,X1) ),
inference(cnf_transformation,[],[f14]) ).
fof(f28,plain,
empty_set = set_difference(singleton(sK3),singleton(sK4)),
inference(cnf_transformation,[],[f17]) ).
fof(f29,plain,
sK3 != sK4,
inference(cnf_transformation,[],[f17]) ).
fof(f32,plain,
! [X3,X0] :
( ~ in(X3,singleton(X0))
| X0 = X3 ),
inference(equality_resolution,[],[f19]) ).
tcf(c_53,plain,
! [X0: $i,X1: $i] :
( ( X0 = X1 )
| ~ in(X0,singleton(X1)) ),
inference(cnf_transformation,[],[f32]) ).
tcf(c_56,plain,
! [X0: $i,X1: $i] :
( in(X0,X1)
| ( set_difference(singleton(X0),X1) != empty_set ) ),
inference(cnf_transformation,[],[f24]) ).
tcf(c_59,negated_conjecture,
sK3 != sK4,
inference(cnf_transformation,[],[f29]) ).
tcf(c_60,negated_conjecture,
set_difference(singleton(sK3),singleton(sK4)) = empty_set,
inference(cnf_transformation,[],[f28]) ).
tcf(c_182,definition,
iPr_def_10 = singleton(sK3),
introduced(definition,[new_symbols(definition,[iPr_def_10])],[]) ).
tcf(c_183,definition,
iPr_def_11 = singleton(sK4),
introduced(definition,[new_symbols(definition,[iPr_def_11])],[]) ).
tcf(c_184,definition,
iPr_def_12 = set_difference(iPr_def_10,iPr_def_11),
introduced(definition,[new_symbols(definition,[iPr_def_12])],[]) ).
tcf(c_185,negated_conjecture,
iPr_def_12 = empty_set,
inference(demodulation,[status(thm)],[c_60,c_183,c_182,c_184]) ).
tcf(c_186,negated_conjecture,
sK3 != sK4,
inference(demodulation,[status(thm)],[c_59]) ).
tcf(c_471,plain,
! [X0: $i] :
( ( X0 = sK4 )
| ~ in(X0,iPr_def_11) ),
inference(superposition,[status(thm)],[c_183,c_53]) ).
tcf(c_508,plain,
! [X0: $i,X1: $i] :
( in(X0,X1)
| ( set_difference(singleton(X0),X1) != iPr_def_12 ) ),
inference(light_normalisation,[status(thm)],[c_56,c_185]) ).
tcf(c_516,plain,
! [X0: $i] :
( in(sK3,X0)
| ( set_difference(iPr_def_10,X0) != iPr_def_12 ) ),
inference(superposition,[status(thm)],[c_182,c_508]) ).
tcf(c_528,plain,
in(sK3,iPr_def_11),
inference(superposition,[status(thm)],[c_184,c_516]) ).
tcf(c_574,plain,
sK3 = sK4,
inference(superposition,[status(thm)],[c_528,c_471]) ).
tcf(c_575,plain,
$false,
inference(forward_subsumption_resolution,[status(thm)],[c_574,c_186]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.01 % Problem : SET880+1 : TPTP v9.3.1. Released v3.2.0.
% 0.00/0.02 % Command : run_iprover 300 /export/starexec/sandbox/benchmark/theBenchmark.p THM
% 0.08/0.34 % Computer : n011.cluster.edu
% 0.08/0.34 % Model : x86_64 x86_64
% 0.08/0.34 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.08/0.34 % Memory : 8046.5625MB
% 0.08/0.34 % OS : Linux 6.8.0-71-generic
% 0.02/15.22 % CPULimit : 300
% 0.02/15.23 % WCLimit : 300
% 0.02/15.23 % DateTime : Thu Sep 24 12:19:36 UTC 2026
% 0.02/15.23 % CPUTime :
% 0.02/15.23 Running run_iprover 300 /export/starexec/sandbox/benchmark/theBenchmark.p THM
% 0.02/15.24 Running first-order theorem proving
% 0.02/15.24 Running: /export/starexec/sandbox/solver/bin/iproveropt-multi-core.sh -d -n -l tptp -s fof_schedule -t 300 /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.02/15.25
% 0.02/15.25 % ======== iProver multi-core TPTP/SMT =========
% 0.02/15.25
% 0.02/15.25 % Detected problem language: tptp
% 0.02/15.26 % Proving...
% 0.14/15.88 % SZS status Started for theBenchmark.p
% 0.14/15.88 % SZS status Theorem for theBenchmark.p
% 0.14/15.88
% 0.14/15.88 %---------------- iProver v3.9.4 (pre CASC 2026/SMT-COMP 2026) ----------------%
% 0.14/15.88
% 0.14/15.88 % ------ iProver source info
% 0.14/15.88
% 0.14/15.88 % git: date: 2026-07-19 20:42:38 +0200
% 0.14/15.88 % git: sha1: 804e7d636a263075307957e923b7a22a4035de61
% 0.14/15.88 % git: non_committed_changes: false
% 0.14/15.88
% 0.14/15.88 % ------ Parsing...
% 0.14/15.88 % ------ Clausification by vclausify_rel & Parsing by iProver...%
% 0.14/15.88
% 0.14/15.88 % ------ Preprocessing... sup_sim: 0 sf_s rm: 1 0s sf_e pe_s pe_e %
% 0.14/15.88
% 0.14/15.88 % ------ Preprocessing... gs_s sp: 0 0s gs_e snvd_s sp: 0 0s snvd_e %
% 0.14/15.88
% 0.14/15.88 % ------ Preprocessing... sf_s rm: 1 0s sf_e sf_s rm: 0 0s sf_e
% 0.14/15.88 % ------ Proving...
% 0.14/15.88 % ------ Problem Properties
% 0.14/15.88
% 0.14/15.88 %
% 0.14/15.88 % clauses 15
% 0.14/15.88 % conjectures 2
% 0.14/15.88 % EPR 6
% 0.14/15.88 % Horn 14
% 0.14/15.88 % unary 9
% 0.14/15.88 % binary 4
% 0.14/15.88 % lits 23
% 0.14/15.88 % lits eq 12
% 0.14/15.88 % fd_pure 0
% 0.14/15.88 % fd_pseudo 0
% 0.14/15.88 % fd_cond 0
% 0.14/15.88 % fd_pseudo_cond 2
% 0.14/15.88 % AC symbols 0
% 0.14/15.88
% 0.14/15.88 % ------ Schedule dynamic 5 is on
% 0.14/15.88
% 0.14/15.88 % ------ Input Options "--resolution_flag false --inst_lit_sel_side none" Time Limit: 10.
% 0.14/15.88
% 0.14/15.88
% 0.14/15.88 % ------
% 0.14/15.88 % Current options:
% 0.14/15.88 % ------
% 0.14/15.88
% 0.14/15.88
% 0.14/15.88 %
% 0.14/15.88
% 0.14/15.88 % ------ Proving...
% 0.14/15.88 %
% 0.14/15.88
% 0.14/15.88 % SZS status Theorem for theBenchmark.p
% 0.14/15.88
% 0.14/15.88 % SZS output start CNFRefutation for theBenchmark.p
% See solution above
% 0.14/15.88
% 0.14/15.88
%------------------------------------------------------------------------------